Behind all the overwrought drug war rhetoric that gets brought to bear on the subject of doping in sports, there are the simple calculations that Lance Armstrong lays out in this unused clip from the documentary The Armstrong Lie, which for all its brevity offers about the most precise explanation of what the problem is and why it isn't going away that there's been.

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Reminder: At noon, we'll be chatting with Alex Gibney, who directed the film.